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1) All the U.S. households that owned at least one television set, 83% had two or more sets. A local cable company canvassing the town to promote a new cable service found that of the 300 randomly selected households visited, 240 had two or more television sets. At 0.05, is there sufficient evidence to conclude that the proportion is less than the one in the report?
2) The average one-way airfare from Pittsburgh to Washington D.C., is $236. A random sample of 20 one-way fares during particular month had a mean of $210 with a standard deviation of $43. At 0.02, is there sufficient evidence to conclude a difference from the stated mean?
3) The number of carbohydrates found in a random sample of fast-food entrees is listed. Is there sufficient evidence to conclude that the variance differs from 100? Use the 0.05 level of significance. Data: 53,46,39,39,30,47,38,73,43,41.
for each of the following statements about the chi-square x2 distribution state whether it is true or false and
For the following cases, determine whether the sampling is dependent or independent. Explain your conclusion.
Suppose a sequence of independent trials is performed where each trial results in either success or failure. Suppose X=the number of failures before the first success, with p=probability of success on any one trial.
low reliability of the variables reduces the correlation coefficient becausea. the deviation scores are less likely to
1. Allen Machines specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Allen Machines is contemplating the construction of a machine that would harvest weeds on narrow rivers and waterways. The activ..
Mr. James McWhinney, President of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
The remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
A sample of households that subscribe to the United Bell Phone Company revealed the following numbers of calls received by each household last week. Determine the mean, median, and standard deviation of the number of calls received.
a system is composed of eight independent subsystems. each subsystem operates 95 of the time. what is the probability
the slider p moves inward by pulling a string is not shown. the arm angular position is given in radians by theta
At significance level of 0.02, is this sample evidence consistent with a hypothesis that 10% or fewer of all dollar bills have anything written on them besides the normal printing?
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
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